Question

What is the direction of magnetic field lines inside a current-carrying solenoid?

Hint:

Remember: Outside \(\rightarrow\) North to South; Inside \(\rightarrow\) South to North.

Answer 1

Step 1: Understanding the Concept:
A solenoid is a long coil of wire.
When current flows through it, it behaves like a bar magnet with distinct North and South poles.

Step 2: Detailed Explanation:
Outside a magnet (or solenoid), magnetic field lines travel from the North pole to the South pole.
Since magnetic field lines form continuous closed loops, they must travel from the South pole to the North pole inside the solenoid to complete the loop.
The lines inside are parallel and straight, indicating a uniform magnetic field.

Step 3: Final Answer:
The direction is from South to North inside the solenoid.